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Gratis Python IDE for commercial use

My company wants me to code Python.
My company won't pay for a Python IDE.
That won't change.

So, what's currently the most full featured Python IDE which I don't have to pay for and can legally use in a commercial environment?

It must support Python 3 and be easilly installable on Ubuntu 12.04 (preferably a package).

Must have: debugger, set breakpoints, run to breakpoint, one step, examine variables, etc.

Nice to have: auto completion


[Update]: Spyder looked excellent, but I can't get it to install with Python 3 support :-(
[Update]: I got it installed (using PIP), but can't configure it to use Python 3 - it's still using Python 2 :-(